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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 988 · 40 sums
TalentJR

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

NameDateTime takenScore ___ / 40
  1. 1.351 + 208 =
  2. 2.A school has 304 children. 126 of them are girls. How many boys are there?
  3. 3.238 − 175 =
  4. 4.A train has 311 people in the front coaches and 571 people in the back coaches. How many people are on the train?
  5. 5.? + 478 = 599
  6. 6.A train has 306 people in the front coaches and 303 people in the back coaches. How many people are on the train?
  7. 7.624 − 557 =
  8. 8.A school has 249 children. 244 of them are girls. How many boys are there?
  9. 9.385 − 119 =
  10. 10.644 + ? = 766
  11. 11.A school has 301 children. 273 of them are girls. How many boys are there?
  12. 12.810 + 184 =
  13. 13.? + 494 = 602
  14. 14.852 − ? = 451
  15. 15.A train has 572 people in the front coaches and 289 people in the back coaches. How many people are on the train?
  16. 16.A train has 296 people in the front coaches and 233 people in the back coaches. How many people are on the train?
  17. 17.442 + 518 =
  18. 18.965 − 265 =
  19. 19.590 + 291 =
  20. 20.A train has 523 people in the front coaches and 469 people in the back coaches. How many people are on the train?
  21. 21.255 + 259 =
  22. 22.736 + 115 =
  23. 23.305 − 180 =
  24. 24.A train has 108 people in the front coaches and 812 people in the back coaches. How many people are on the train?
  25. 25.A train has 177 people in the front coaches and 774 people in the back coaches. How many people are on the train?
  26. 26.837 − 623 =
  27. 27.312 + ? = 783
  28. 28.931 − 564 =
  29. 29.238 + 310 =
  30. 30.561 − 196 =
  31. 31.? + 383 = 704
  32. 32.A school has 853 children. 510 of them are girls. How many boys are there?
  33. 33.A school has 227 children. 153 of them are girls. How many boys are there?
  34. 34.538 − 447 =
  35. 35.870 − ? = 429
  36. 36.161 + ? = 385
  37. 37.282 + ? = 772
  38. 38.147 + 642 =
  39. 39.713 + 128 =
  40. 40.967 − ? = 125

Answer key

  1. 559
  2. 178
  3. 63
  4. 882
  5. 121
  6. 609
  7. 67
  8. 5
  9. 266
  10. 122
  11. 28
  12. 994
  13. 108
  14. 401
  15. 861
  16. 529
  17. 960
  18. 700
  19. 881
  20. 992
  21. 514
  22. 851
  23. 125
  24. 920
  25. 951
  26. 214
  27. 471
  28. 367
  29. 548
  30. 365
  31. 321
  32. 343
  33. 74
  34. 91
  35. 441
  36. 224
  37. 490
  38. 789
  39. 841
  40. 842

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